Propagation of plane waves in poroviscoelastic anisotropic media

This study discusses wave propagation in perhaps the most general model of a poroelastic medium. The medium is considered as a viscoelastic, anisotropic and porous solid frame such that its pores of anisotropic permeability are filled with a viscous fluid. The anisotropy considered is of general type, and the attenuating waves in the medium are treated as the inhomogeneous waves. The complex slowness vector is resolved to define the phase velocity, homogeneous attenuation, inhomogeneous attenuation, and angle of attenuation for each of the four attenuating waves in the medium. A non-dimensional parameter measures the deviation of an inhomogeneous wave from its homogeneous version. An numerical model of a North-Sea sandstone is used to analyze the effects of the propagation direction, inhomogeneity parameter, frequency regime, anisotropy symmetry, anelasticity of the frame, and viscosity of the pore-fluid on the propagation characteristics of waves in such a medium.     

弹性平面扇形域问题及哈密顿体系

通过变量代换及变分原理，将平面弹性扇形域的方程导向哈密顿体系，从而可用分离变量法、本征函数展开等方法求解扇形域的分析单元，这样便可以与有限元的程序系统相结合。显示了哈密顿体系、辛数学的应用潜力。     

不用克希霍夫—拉夫假设的弹性圆板理论再探

本文在不用克希霍夫一拉夫假设的弹性板一般理论的基础上，建立了不用克希霍夫一拉夫假设的弹性圆板的一级近似理论，对圆板在四周固定和均布载荷的条件下，得到了具体的轴对称分析解，并和经典的圆薄板解进行了比较，证明本文新解更加接近实验结果，本文也具体地讨论了理论结果中厚度增大时的影响。     

Crack tip field in functionally gradient material with exponential variation of elastic constants in two directions

This paper presents an exact solution of the crack tip field in functionally gradient material with exponential variation of elastic constants. The dimensionless Poisson's ratios ν ₀ of the engineering materials (iron, glass . . .) are far less than one; therefore, neglecting them, one can simplify the basic equation and the exact solution is easy to obtain. Although the exact solution for the case ν ₀≠0 is also obtained, it is very complicated and the main result is the same with the case ν ₀=0 (it will be dealt with in Appendix VII). It has been found that the exponential term exp (ax+by) in the constitutive equations becomes exp (ax/2+by/2?kr/2) in the exact solution.     

常体力真平面应力情况经典强度理论相当应力的最大点

本文从弹性力学空间问题相容方程推导出常体力真平面应力情况下各应力分量都为调和函数，进而得出经典强度理论相当应力都为下调和函数，通过对经典强度理论相当应力性质的讨论，得到在常体力真平面应力情况下，相当应力的最大值都在平板的边界上达到。     

研究生弹性力学教学方法及问题探讨

 介绍了几年来在研究生弹性力学教学中所采用的方法，着重在自学能力的培养、局域网的 利用、启发式和讨论式教学方法的实践等几个方面进行了探索，并将课堂上讨论的一些问题 做了具体介绍.     

Inter-contact force analysis of impacted disk assembly by dynamic caustics

The caustic method was utilized to study the contact force transmission in disk assemblies under impact load. The mapping equations were obtained based on the first invariant of the stress components in the disk subject to a normal concentrated force, and a characteristic dimension of the maximum size in the caustic curve was proposed to evaluate the contact force between the disks. Transient patterns of the caustic shadows were recorded by means of a high-speed camera of off-focus imaging, then the histories of the inter-contact forces among the disks were obtained with respect to the conditions of different masses and heights of the falling hammers. The influence of the impact loading and impulsive velocity was analyzed with respect to the force responses of the disk assembly, the double-peak phenomenon with comparison to the initial masses, and the energy dissipation of the systems under impact of different momentums. The project supported by the National Natural Science Foundation of China (10125211)     

弹性力学的Lagrange形式：用Routh方法建立弹性有限变形问题的基本方程

将弹性有限变形问题纳入Lagrange力学的理论体系中，并用经典力学中业已存在的Routh方法构建了有限变形平面应变问题和有限变形平面应力问题的基本微分方程，讨论了有限变形大挠度问题vonkarman方程中存在的矛盾进而提出了两种改进方案．     

用楔形体解答求解矩形变截面梁及其适用范围

根据弹性力学课程中楔形体受重力和液体压力,以及楔形体在楔顶或楔面受力时的基本解答,利用圣维南原理和叠加原理,对工程中常见的矩形变截面悬臂梁（坝体）的应力解答进行求解.同时,应用有限单元法对所得结果进行校核,进而讨论该方法的适用范围.     

域外奇点法在弹性力学中的应用

本文将域外奇点法推广应用于弹性力学问题,求解了扭转问题,平面弹性问题和平面弯曲问题.计算表明,这种方法简单,计算时间短,精度高。